JPH0214999Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a load bearing structure for a seatbelt, and more specifically, by interposing a seat track between a mounting base and a seat cushion frame, the seat cushion is moved in the longitudinal direction with respect to the vehicle body. In automobile seats whose positions can now be adjusted, seatbelt anchors are attached to the seat cushion frame, and relative movement in the vertical direction between the seat cushion frame and the seat mounting base is controlled when the seat is in the rearmost position. By providing a robust load transmission means configured to be able to block the load, the seat belt is made easier to handle, and the enormous tensile load applied to the seat belt in an emergency is effectively supported by the seat mounting base via the load transmission means. Concerning what was done.

Seat belts for the rear seats of automobiles are configured to be used by connecting a pair of left and right belts that wrap around the waist or lower abdomen of an occupant from back to front and connect them at the front of the occupant's body. In general, in rear seats of passenger cars, which are fixed to a floor member or the like and cannot be moved forward or backward, the seatbelt anchor that fixes the base end of the seatbelt is attached to the seat cushion and seat back. The seat belt is configured to be fixed to the floor member after passing through the gap. In this case, in the unlikely event of an emergency, the tensile load applied to the seat belt is directly supported by the floor member, effectively preventing the occupant from being thrown forward.

By the way, the wagon type 7, which has been actively developed recently,
In some passenger cars that seat one to eight people, one of two sets of rear seats, front and rear, is rotatable so that these rear seats can face each other. There are also some vehicles in which a seat track is interposed between the seat mounting base and the seat cushion frame, allowing the seat to move forward and backward relative to the vehicle body.
The seat belt anchor for such a seat cannot be fixed to a floor member or a seat mounting base as in the case of the above-mentioned normal fixed seat. In this way, it becomes impossible to rotate the seat itself in the case of a rotating seat, and in the case of a seat that can be moved forward and backward, the effective length of the seat belt changes depending on the seat position. This is because the length of the seatbelt must be adjusted every time the position of the seatbelt is changed.

In this case, the seat belt anchor must be attached to the seat cushion frame. However, when attaching a seatbelt anchor to a seat component that can move back and forth, the enormous tensile load applied to the seatbelt in an emergency will ultimately reach the seat mounting base via the seat cushion frame, seat track, and other components. In order to prevent these components from breaking and the occupant being thrown forward, the seat components, including the seat and seat mounting base, must be supported by supporting the weight of the seat and the occupant. It will be necessary to make it far more durable than necessary. In this way, constructing the members interposed between the seat and the seat mounting base in such a way that they can withstand the load in case of an emergency increases the cost of materials and significantly increases the weight of the vehicle. There is the problem of inviting.

As a solution to this problem, for example, as shown in Japanese Utility Model Application Publication No. 49-77624, the seat belt anchor of the seat belt is engaged with a part of the seat mounting base such as the floor member only in an emergency. There is something I tried to do. This device fastens the end of the seatbelt near the pivot of the engaging arm, which is rotatably attached to the side of the seat cushion with a certain amount of resistance. When a strong tensile load is applied, the engaging arm rotates overcoming the resistance, and the engaging claw at the tip thereof engages with a lock pin fixedly provided on the seat mounting base. In other words, in normal times, the tensile force of the seat belt is supported by the seat cushion, but in an emergency, the enormous tensile load applied to the seat belt is supported by the seat mounting base via the engaging arm. The maximum load that the seat belt should be able to support in an emergency is made compliant with safety standards without unnecessarily increasing the strength of the seat itself or the members interposed between the seat and the seat mounting base.

However, even with the above conventional example, since a huge load is supported through the engaging arm, the engaging arm and the structure for pivoting it must have considerable strength. Therefore, these engaging arms and their support structures have to have a larger external shape and an increased weight. In the case of automobile seats that are rotatable and equipped with a seat track, the rotating mechanism already causes a significant increase in vehicle weight, so the configurations of the above-mentioned conventional examples further increase the vehicle weight. result.

The present invention was devised under the above circumstances, and its purpose is to provide a load transmission means with an extremely simple structure that is rotatable with respect to the vehicle body floor and that can be rotated in the longitudinal direction. The heavy load applied to the seat belt anchor attached to the movable seat cushion frame in the event of an emergency is
It is an object of the present invention to provide a load bearing structure for a seat belt, which is supported on a seat mounting base via the load transmission means, and is capable of lowering the required strength of members such as a seat track.

In order to achieve this purpose, in this invention,
The following technical measures have been taken:

In other words, the load bearing structure of the seat belt in the rotating automobile seat of the present invention rotatably supports the seat mounting base with respect to the seat pedestal fixed to the floor member, and also supports the seat belt with respect to the seat mounting base. The seat cushion frame is supported through the seat cushion frame, and is rotatable relative to the vehicle body.
A load-bearing structure for a seatbelt in a rotary automobile seat whose position in the longitudinal direction can be adjusted, wherein a seatbelt anchor is fixed to the rear of the seat cushion frame, and a seat belt anchor is fixed to the rear of the seat cushion frame, and the seat belt is attached to the seat cushion frame and the seat mounting base. One member has a cross section of approximately a hat having a horizontal U-shaped cross section, a pair of collars extending perpendicularly from both edges of the collar, and ribs fixed so as to span the grooves of the horizontal U-shaped cross section. A locking piece having a shape of a shape is fixed to the back of the horizontal U-shaped cross section, and a pair of locking pieces capable of simultaneously holding both flanges of the locking piece are attached to the other member of the seat cushion frame and the seat mounting base. A holding member having a substantially channel cross section having a substantially U-shaped cross section on both edges is fixed, and the locking piece and the holding member are moved relative to each other by the seat track when the seat cushion frame and the seat mounting base are moved. The present invention is characterized in that load transmitting means are arranged so as not to interfere with each other as far as possible.

When the seat cushion frame is at the reference position, that is, at the rearmost position, the holding members overlap each other so as to hold the locking pieces, and the two cannot move relative to each other in the vertical direction. The locking piece and the holding member are each formed in the above-mentioned special shape, so that even if a strong external force is applied to separate them in the vertical direction, they will not be easily destroyed. It has strength. In an emergency, a strong force is applied to the seat belt anchor or the seat cushion frame to try to peel it off from the seat mounting base, but this force is applied to the seat belt anchor or the seat cushion frame by the above-mentioned locking piece and holding member. Since the seat is effectively supported by the seat mounting base through the load transmission means, a situation where the occupant is thrown forward along with the seat can be effectively avoided. Moreover, since the locking piece and the holding member each have a special cross-sectional shape, the length of the locking piece in the orbital direction of the seat track can be made extremely small, and even if the cross-sectional area of the member is Even if the strength is significantly increased by increasing the strength, the weight does not increase significantly. Therefore, the seat belt load bearing structure of the present invention is suitable for use in rotating seats where the rotation mechanism inevitably increases the weight. , making it a very effective and efficient safety mechanism.

Embodiments of the present invention will be specifically described below with reference to the drawings.

The seat 1 is movable in the longitudinal direction with respect to a seat mounting base 3 by means of a seat track 2. That is, an upper rail 6 is attached to the lower part of the seat cushion frame 4 via a suitable bracket 5, and this upper rail 6 is slidably engaged with a lower rail 7 attached to the upper surface of the seat mounting base 3 in the front-rear direction. It matches. Incidentally, a locking mechanism is actually provided for fixing the seat cushion frame 4 at a desired position within its longitudinal movement range, but this is not an essential part of the present invention and is therefore omitted from illustration. Further, the seat mounting base 3 is rotatably supported by a known mechanism with respect to a seat pedestal 8 fixed to a floor member 9.
can be forward-facing or backward-facing.

The rear portions 4a' of the side frames 4a of the seat cushion frame 4, and the rear portions 4 when the seat cushion 4 is located at the rearmost position, that is, when the seat cushion is at the reference position.
a' and the corresponding part on the seat mounting base 3, the seat cushion frame 4 is allowed to move in the trajectory direction of the seat track relative to the seat mounting base 3, and the seat cushion frame is connected to the seat mounting base 3. Load transfer means 10 are provided which can prevent upward movement relative to the mounting base 3.

Details of this load transmission means 10 are shown in FIG. 2 and below.

As shown in FIG. 2, the side frame 4a of the seat cushion frame has a support piece 12 formed by folding a plate member having a certain thickness.
The upper end portion is fixed by means such as welding, and the tip portion 12a of this is attached to a vertical side plate 1 provided on the seat mounting base 3 and extending in the front-rear direction.
1, extending parallel to each other and facing each other. Inside the tip 12a of this support piece 12,
The back of the locking piece 13, which has a substantially hat-shaped cross section and has upper and lower flanges 13a and 13b that extend in the vertical direction, is fixed by welding or the like. In addition, the above-mentioned collar 13a,
The edge of the seat track 13b is parallel to the direction of the trajectory of the seat track 2. This locking piece 13 is
In an emergency, the seat cushion frame 4 is engaged with a holding member 14 (described later) to prevent the seat cushion frame 4 from being torn off from the seat mounting base 3, thereby ensuring the safety of the occupant restrained by the seat belt. It is preferable to use a material with high mechanical strength, such as high tensile strength steel. Further, as shown in FIG. 2, if a rib 15 is provided in the U-shaped space of the locking piece 13, the upper and lower flanges 13
Since the collars 13a and 13b are strong against the force that tends to compress them in the vertical direction, the strength can be increased in an emergency when the collars 13a and 13b engage with a holding member 14, which will be described later, which is advantageous. In addition, support piece 1
A seat belt anchor 17 is fixed with a bolt 18 at a position shifted in the front-rear direction from the position where the locking piece 13 is fixed at the tip of the seat belt 2 .

On the other hand, upper and lower flanges 13a, 13 of the locking piece 13 are provided on the outer surface of the side wall 11 of the seat mounting base 3.
A holding member 14, which is formed to have a pair of substantially U-shaped cross-sections and which holds b, is fixed by welding or the like. That is, this holding member 14 includes a back portion 14a that is in close contact with the outer surface of the side wall 11, and an upper collar 13 of the locking piece 13 extending from the upper and lower ends of the back portion 14a.
Upper and lower horizontal portions 14b, 14 extend outward through the upper part of a and the lower part of the lower collar 13b, respectively.
b, and vertical portions 14c, 14c extending in the vertical direction from the tips of these horizontal portions 14b, 14b so as to approach each other. As clearly shown in FIG. 2, the vertical portions 14c, 14c
The distance between the ends of the locking piece 13 is narrower than the width of the locking piece 13 in the vertical direction. Note that this holding member 1
Similarly to the locking piece 13, the locking piece 4 should also be made of a material with high mechanical strength.

The locking piece 13 and the holding member 14 do not interfere with each other as long as the seat cushion frame 4 moves back and forth along the trajectory of the seat track 2. However, as shown in FIG. 1 or FIG. 2, when the seat cushion frame 4 is located at the rearmost position in its longitudinal movement range, a strong tensile force is applied to the seat belt 16 in the direction of the arrow in FIG. As a result, when a force is applied to the seat cushion frame 4 to peel it off from the seat mounting base 3, in other words, as shown in FIG. When a force is applied to pull the seat up, the members interposed between the seat cushion frame and the seat mounting base 3, such as the seat track, are succumbed to the force and distorted, and eventually the locking piece 13 and the holding member 14 are They engage with each other, and the above-mentioned strong force is reliably supported by the seat mounting base 3 via the locking piece 13 and the holding member 14.

As described above, in the seat belt load bearing structure according to the present invention, the weight of the seat and occupant and the tensile load of the seat belt under normal conditions are transferred to a structure such as a seat track that is interposed between the seat cushion frame and the seat mounting base. It is supported by the strength of the member itself, and in case of an emergency, a load transmission means with a large load capacity that is formed separately from the above-mentioned structural members is used to absorb the enormous force that would try to tear off the seat cushion frame. I try to accept it. Therefore, it is not necessary to make the members such as the seat track extremely strong in case of an emergency, which greatly contributes to reducing the weight of the vehicle and the cost of materials.
In particular, in the present invention, the locking piece that forms the center of the load transmitting means is formed into a ribbed hat-shaped cross section, and the holding member is also configured to effectively hold the locking piece, so that the above-mentioned emergency can be avoided. Not only can safety be improved by effectively supporting the enormous force of time, but in particular, there is no problem even if the length of the locking piece in the trajectory direction of the seat track can be significantly shortened.
Therefore, the seatbelt load-bearing structure of the present invention has an extremely high load-bearing effect in a rotary automobile seat, and is efficient in suppressing weight increase as much as possible. In addition, the load transmitting means has an extremely simple structure in which a fixed locking piece and a holding member are respectively fixed to the seat cushion frame and the seat mounting base.
It is easy to implement and does not cost much.

It goes without saying that the scope of the present invention is not limited to the embodiments shown in the drawings.

That is, in the illustrated example, the locking piece is provided on the seat cushion frame side, and the holding member for holding it is provided on the seat mounting base side.
On the contrary, the same effect can be obtained even if the locking piece is attached to the seat mounting base and the holding member is attached to the seat cushion frame. Further, the seat belt anchor does not necessarily need to be fixed to the support piece as in the illustrated example, but may be fixed to any part of the seat cushion frame or a member integral therewith.

[Brief explanation of the drawing]

FIG. 1 is a partial cross-sectional side view of a seat to which the structure of the present invention is applied, FIG. 2 is a cross-sectional view taken along the line -- in FIG. 1, and FIG. 3 is a perspective view showing a support piece and a locking piece. FIG. 4 is a perspective view showing the holding member. 1...Seat, 2...Seat track, 3...
Seat mounting base, 4... Seat cushion frame, 8... Seat pedestal, 9... Floor member, 10... Load transmission means, 13... Locking piece, 1
3a, 13b... tsuba, 14... holding member, 15...
...Rib, 17...Seat belt anchor.

Claims (1)

[Claims for Utility Model Registration] A seat mounting base is rotatably supported on a seat base fixed to a floor member, and a seat cushion frame is supported on the seat mounting base via a seat track. and is rotatable relative to the vehicle body,
A load-bearing structure for a seatbelt in a rotary automobile seat whose position in the longitudinal direction can be adjusted, wherein a seatbelt anchor is fixed to the rear of the seat cushion frame, and a seat belt anchor is fixed to the rear of the seat cushion frame, and the seat belt is attached to the seat cushion frame and the seat mounting base. One member has a cross section of approximately a hat having a horizontal U-shaped cross section, a pair of collars extending perpendicularly from both edges of the collar, and ribs fixed so as to span the grooves of the horizontal U-shaped cross section. A locking piece having a shape of a shape is fixed to the back of the horizontal U-shaped cross section, and a pair of locking pieces capable of simultaneously holding both flanges of the locking piece are attached to the other member of the seat cushion frame and the seat mounting base. A holding member having a substantially channel cross section having a substantially U-shaped cross section on both edges is fixed, and the locking piece and the holding member are moved relative to each other by the seat track when the seat cushion frame and the seat mounting base are moved. 1. A load bearing structure for a seat belt in a rotary automobile seat, characterized in that load transmitting means are arranged so as not to interfere with each other as far as possible.